a(n) = n*(3*n + 8).

Terms

a(0) =0a(1) =11a(2) =28a(3) =51a(4) =80a(5) =115a(6) =156a(7) =203a(8) =256a(9) =315a(10) =380a(11) =451a(12) =528a(13) =611a(14) =700a(15) =795a(16) =896a(17) =1003a(18) =1116a(19) =1235a(20) =1360a(21) =1491a(22) =1628a(23) =1771a(24) =1920a(25) =2075a(26) =2236a(27) =2403a(28) =2576a(29) =2755